58 lines
2.0 KiB
Java
58 lines
2.0 KiB
Java
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view.animation;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.graphics.Matrix;
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/**
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* Special case of TranslateAnimation that translates only vertically, picking up the
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* horizontal values from whatever is set on the Transformation already. When used in
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* conjunction with a TranslateXAnimation, allows independent animation of x and y
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* position.
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* @hide
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*/
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public class TranslateYAnimation extends TranslateAnimation {
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float[] mTmpValues = new float[9];
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/**
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* Constructor. Passes in 0 for the x parameters of TranslateAnimation
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*/
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public TranslateYAnimation(float fromYDelta, float toYDelta) {
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super(0, 0, fromYDelta, toYDelta);
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}
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/**
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* Constructor. Passes in 0 for the x parameters of TranslateAnimation
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*/
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@UnsupportedAppUsage
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public TranslateYAnimation(int fromYType, float fromYValue, int toYType, float toYValue) {
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super(ABSOLUTE, 0, ABSOLUTE, 0, fromYType, fromYValue, toYType, toYValue);
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}
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/**
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* Calculates and sets y translation values on given transformation.
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*/
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@Override
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protected void applyTransformation(float interpolatedTime, Transformation t) {
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Matrix m = t.getMatrix();
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m.getValues(mTmpValues);
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float dy = mFromYDelta + ((mToYDelta - mFromYDelta) * interpolatedTime);
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t.getMatrix().setTranslate(mTmpValues[Matrix.MTRANS_X], dy);
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}
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}
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